<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM\Internal\Hydration;

use Doctrine\DBAL\Connection;

/**
 * Hydrator that hydrates a single scalar value from the result set.
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @since 2.0
 */
class SingleScalarHydrator extends AbstractHydrator {
	/** @override */
	protected function _hydrateAll() {
		$cache = array();
		$result = $this->_stmt->fetchAll( \PDO::FETCH_ASSOC );
		$num = count( $result );
		
		if( $num == 0 ) {
			throw new \Doctrine\ORM\NoResultException();
		} else if( $num > 1 || count( $result[key( $result )] ) > 1 ) {
			throw new \Doctrine\ORM\NonUniqueResultException();
		}
		
		$result = $this->_gatherScalarRowData( $result[key( $result )], $cache );
		
		return array_shift( $result );
	}
}